Trolltech, Nokia, Qt Software released QT 4.5 and the final (1.0) version of QT Creator.

From the announcement:

Qt 4.5 is setting the benchmark for application development,” said Benoit Schillings, Chief Technologist, Qt Software, Nokia. “With the performance improvements in Qt, the introduction of Qt Creator, and the release of the Qt SDK, developers looking for a native or a hybrid native/web application framework now have the power and flexibility they need.